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fix bug with SlantedTriangular LR scheduler #4443
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There is a bug related to gradual unfreezing with the Slanted Triangular Learning Rate schedule. During the first epoch, only the top layer is trained (as expected) but, during the 2nd epoch, the top 3 layers are trained when it should just be the top 2:
This also causes training to crash on the last "freezing" epoch: